Photographs published online and Chinese military sources cited by the Japanese media indicate a test model of the J-20 fighter has been finished, with taxi tests carried out last week at an airfield in southwestern China.
The news comes just days before a visit to Beijing by US Defence Secretary Robert Gates, who will seek to mend military ties cut off a year ago by China when Washington sold billions of dollars in arms to its rival Taiwan.
Experts say the J-20 will eventually rival the US Air Force's F-22, the world's only fully operational next-generation stealth fighter jet -- but not any time soon.